Method for making overlays for producing half-tone cuts



ingly good quality. H The method of producing an overlay con- Patented Jan. 9 1923 nairanfsrara ST. PA L Jonas, or PITTSBURGH,PENNSYLVANIA, -ASSIGNOROF one- HALF T0 WILLARD E. K NEDY, or PITTSBURGH,;PENNSYLVANIA. v

METHOD r013 MAKING ovnanAYs No Drawing. Application filed May 1 0,

To all 0 7mm it may concern:

Be it known that I, ST. PAUL donate, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny andState of Pennsylvania, have invented certain new and useful Improvements in Methods for Making Overlays for Producing Half-Tone Cuts, of which the follow ing is a specification. I

This invention relates to a method for making overlays for producing or printing half-tone cuts.

The purpose of the invention is to provide means whereby an overlay may be pro duced in a short interval oftime at a relatively low cost and said overlay being adapted to produce half-tone cuts of an exceedsists in taking a'freshly inked proof and dusting the same with a particular kind of powder. Any particles of powder clinging to the proof is removed and the proof is then heated. Immediately after heating the proof is dippedina particular liquid and the same is then complete and ready for printing half-tone cuts.

The particular powder to be used should consist in 2 parts of 00 line emery dust and 1 part of finely powdered rosin. These two substances should be thoroughly mixed.

The liquid should consist of one part ofsilicate ofsoda and three parts of water.

, In preparing an overlay a proof may be pulled and well inked, that isinked sufficiently to bring out the solids in a decided black and withoutblurring the high lights. The proof may be pulled on book paper, preferably on the 60 lb. book'paper.

The powder may now be dusted over the wet proof and then all surplus powder should be dislodged by slightly shakingthe proof. The high lightsmay now be brushed out and the medium tones partly brushed. Any ordinary camel hair brush will be suitable for this purpose. The proof isnow heated preferably on its side opposite to that which has been powdered. Any convenient means may be utilized for heating the proof.

I The, proof after being treated as above described is now quickly dipped in the liquid consisting of silicate of soda and water and then permitted to dry a minute I proof to dry.

roza r nonnoine-"HALrroivn curs.

1922. Serial" mi 5559,5561.

or two. I It has been found by ex'perience that an overlay prepared in this manner can be completed in about five minutes.

The overlay is now used for printing half-tone cuts and this is carried out in a manner well known by those skilled in the art.

a powder. of the character described the same adheresto solids where the heaviest overlay is needed. Little powder adheres to 3 It may be here mentioned-that by using the medium tones in the proof and the high lights are left bare of the powder. By the use of a brush the high lightsmay be brushed out and by lightly brushing the medium tones of the proof removes any surplus powder that may not have been shaken ofi. q i

It is also important to: point out that the action of the heat on the powder causes the rosin to melt and slightly raise 011 the surface and thus fixes the emery powder on the places where it is needed to bring out the impression.

The solution of silicate'ofsoda and water is merely to serve to ensure that the powder fixed by the heat action on the overlay paper is of a permanent nature so that it will not give way or wear-loose-during long printing runs. In other words, the solution dries quickly and ensures the permanency of the overlay.

What I claim is: 1

1. The method of producii'lg an overlay of the character described which consists in I taking an inked proof, powdering the same then heating the proof a predetermined interval and then dipping the-proof in a soluin taking an inked proof and powdering the same with a powder consisting of emery dust and rosin. then heating the proof and then dipping the proof in a'liquid, solution of silicate of soda and water a predetermined interval and then permitting the .3. The methodof preparing an overlay of the character described which consists in taking an inked proof,powdering the same with a powder adapted to intimately combine with the ink upon said proof, then heating the proof a predetermined interval, then dipping the proof in a solution adapted to further set the ink and powder and then permitting the proof to dry.

i. The. method of preparing an overlay of the character described which consists in taking an inked proof, powdering the same With a powder adapted to intimately combine With ink, heating, the proof upon its unpowdered side, then dipping the proof in asolution adapt-ed to further set the ink and powder and then permitting the proof to dry.

5. The method of preparing an overlay \Vith. ink upon said proof; then dipping the proof in a solutlon adapted to further set the ink and powder, and then permitting the proof to dry.

ST. PAUL JOHN5 

